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<meta name="description" content="Servlet 表单数据   很多情况下，需要传递一些信息，从浏览器到 Web 服务器，最终到后台程序。浏览器使用两种方法可将这些信息传递到 Web 服务器，分别为 GET 方法和 POST 方法。   GET 方法 GET 方法向页面请求发送已编码的用户信息。页面和已编码的信息中间用 ? 字符分隔，如下所示：  http://www.test.com/hello?key1=value1&amp;key2=value2  GET 方法是..">
		
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			<h1>Servlet <span class="color_h1">表单数据</span></h1>


<p>很多情况下，需要传递一些信息，从浏览器到 Web 服务器，最终到后台程序。浏览器使用两种方法可将这些信息传递到 Web 服务器，分别为 GET 方法和 POST 方法。</p>


<h2>GET 方法</h2>
<p>GET 方法向页面请求发送已编码的用户信息。页面和已编码的信息中间用 ? 字符分隔，如下所示：</p>
<pre class="prettyprint">
http://www.test.com/hello?key1=value1&amp;key2=value2
</pre>
<p>GET 方法是默认的从浏览器向 Web 服务器传递信息的方法，它会产生一个很长的字符串，出现在浏览器的地址栏中。如果您要向服务器传递的是密码或其他的敏感信息，请不要使用 GET 方法。GET 方法有大小限制：请求字符串中最多只能有 1024 个字符。</p>
<p>这些信息使用 QUERY_STRING  头传递，并可以通过 QUERY_STRING 环境变量访问，Servlet 使用 <b>doGet()</b> 方法处理这种类型的请求。</p>

<h2>POST 方法</h2>
<p>另一个向后台程序传递信息的比较可靠的方法是 POST 方法。POST 方法打包信息的方式与 GET 方法基本相同，但是 POST 方法不是把信息作为 URL 中 ? 字符后的文本字符串进行发送，而是把这些信息作为一个单独的消息。消息以标准输出的形式传到后台程序，您可以解析和使用这些标准输出。Servlet 使用 doPost() 方法处理这种类型的请求。</p>

<h2>使用 Servlet 读取表单数据</h2>
<p>Servlet 处理表单数据，这些数据会根据不同的情况使用不同的方法自动解析：</p>
<ul class="list">
<li><b>getParameter()：</b>您可以调用 request.getParameter() 方法来获取表单参数的值。</li>
<li><b>getParameterValues()：</b>如果参数出现一次以上，则调用该方法，并返回多个值，例如复选框。</li>
<li><b>getParameterNames()：</b>如果您想要得到当前请求中的所有参数的完整列表，则调用该方法。</li>
</ul>

<h2>使用 URL 的 GET 方法实例</h2>
<p>下面是一个简单的 URL，将使用 GET 方法向 HelloForm 程序传递两个值。</p>
<p><b><strong>http://localhost:8080/TomcatTest/HelloForm?name=菜鸟教程&url=www.runoob.com</strong></b></p>
<p>下面是处理 Web 浏览器输入的 <b>HelloForm.java</b> Servlet 程序。我们将使用 <b>getParameter()</b>  方法，可以很容易地访问传递的信息：</p>
<pre>
package com.runoob.test;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class HelloForm
 */
@WebServlet("/HelloForm")
public class HelloForm extends HttpServlet {
&nbsp;&nbsp;&nbsp;&nbsp;private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public HelloForm() {
        super();
        // TODO Auto-generated constructor stub
    }

&nbsp;&nbsp;&nbsp;&nbsp;/**
&nbsp;&nbsp;&nbsp;&nbsp; * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
&nbsp;&nbsp;&nbsp;&nbsp; */
&nbsp;&nbsp;&nbsp;&nbsp;protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// 设置响应内容类型
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;response.setContentType("text/html;charset=UTF-8");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PrintWriter out = response.getWriter();
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String title = "使用 GET 方法读取表单数据";
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// 处理中文
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String name =new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String docType = "&lt;!DOCTYPE html&gt; \n";
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println(docType +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;html&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;head&gt;&lt;title&gt;" + title + "&lt;/title&gt;&lt;/head&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;body bgcolor=\"#f0f0f0\"&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;h1 align=\"center\"&gt;" + title + "&lt;/h1&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;ul&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "  &lt;li&gt;&lt;b&gt;站点名&lt;/b&gt;："
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    + name + "\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "  &lt;li&gt;&lt;b&gt;网址&lt;/b&gt;："
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    + request.getParameter("url") + "\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;/ul&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;/body&gt;&lt;/html&gt;");
&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;// 处理 POST 方法请求的方法
&nbsp;&nbsp;&nbsp;&nbsp;public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;doGet(request, response);
&nbsp;&nbsp;&nbsp;&nbsp;}
}
</pre>
然后我们在 <b>web.xml</b> 文件中创建以下条目：</p>
<pre>
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;web-app&gt;
  &lt;servlet&gt;
    &lt;servlet-name&gt;HelloForm&lt;/servlet-name&gt;
    &lt;servlet-class&gt;com.runoob.test.HelloForm&lt;/servlet-class&gt;
  &lt;/servlet&gt;
  &lt;servlet-mapping&gt;
    &lt;servlet-name&gt;HelloForm&lt;/servlet-name&gt;
    &lt;url-pattern&gt;/TomcatTest/HelloForm&lt;/url-pattern&gt;
  &lt;/servlet-mapping&gt;
&lt;/web-app&gt;
</pre>
<p>现在在浏览器的地址栏中输入 <i><strong>http://localhost:8080/TomcatTest/HelloForm?name=菜鸟教程&url=www.runoob.com</strong></i> ，并在触发上述命令之前确保已经启动 Tomcat 服务器。如果一切顺利，您会得到下面的结果：</p>
<p><img decoding="async" src="//www.runoob.com/wp-content/uploads/2014/07/775E6A82-D4BF-4499-A934-DDA7B3D70555.jpg"></p>
<hr>

<h2>使用表单的 GET 方法实例</h2>
<p>下面是一个简单的实例，使用 HTML 表单和提交按钮传递两个值。我们将使用相同的 Servlet HelloForm 来处理输入。</p>
<pre>
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;meta charset="utf-8"&gt;
&lt;title&gt;菜鸟教程(runoob.com)&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;form action="HelloForm" method="GET"&gt;
网址名：&lt;input type="text" name="name"&gt;
&lt;br /&gt;
网址：&lt;input type="text" name="url" /&gt;
&lt;input type="submit" value="提交" /&gt;
&lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;
</pre>
<p>保存这个 HTML 到 hello.html 文件中，目录结构如下所示:</p>
<p><img decoding="async" src="//www.runoob.com/wp-content/uploads/2014/07/hell-form.jpg" width="40%"></p>
<p>尝试输入网址名和网址，然后点击"提交"按钮，Gif 演示如下：</p>
<p><img decoding="async" src="//www.runoob.com/wp-content/uploads/2014/07/servlet9.gif"></p>
<hr>
<h2>使用表单的 POST 方法实例</h2>
<p>让我们对上面的 Servlet 做小小的修改，以便它可以处理 GET 和 POST 方法。下面的 <b>HelloForm.java</b> Servlet 程序使用 GET 和 POST 方法处理由 Web 浏览器给出的输入。</p>
<blockquote>
<p>注意：如果表单提交的数据中有中文数据则需要转码：</p>
<pre>
String name =new String(request.getParameter("name").getBytes("ISO8859-1"),"UTF-8");
</pre>
</blockquote>


<pre>
package com.runoob.test;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class HelloForm
 */
@WebServlet("/HelloForm")
public class HelloForm extends HttpServlet {
&nbsp;&nbsp;&nbsp;&nbsp;private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public HelloForm() {
        super();
        // TODO Auto-generated constructor stub
    }

&nbsp;&nbsp;&nbsp;&nbsp;/**
&nbsp;&nbsp;&nbsp;&nbsp; * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
&nbsp;&nbsp;&nbsp;&nbsp; */
&nbsp;&nbsp;&nbsp;&nbsp;protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// 设置响应内容类型
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;response.setContentType("text/html;charset=UTF-8");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PrintWriter out = response.getWriter();
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String title = "使用 POST 方法读取表单数据";
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// 处理中文
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String name =new String(request.getParameter("name").getBytes("ISO8859-1"),"UTF-8");
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String docType = "&lt;!DOCTYPE html&gt; \n";
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println(docType +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;html&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;head&gt;&lt;title&gt;" + title + "&lt;/title&gt;&lt;/head&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;body bgcolor=\"#f0f0f0\"&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;h1 align=\"center\"&gt;" + title + "&lt;/h1&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;ul&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "  &lt;li&gt;&lt;b&gt;站点名&lt;/b&gt;："
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    + name + "\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "  &lt;li&gt;&lt;b&gt;网址&lt;/b&gt;："
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    + request.getParameter("url") + "\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;/ul&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;    "&lt;/body&gt;&lt;/html&gt;");
&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;// 处理 POST 方法请求的方法
&nbsp;&nbsp;&nbsp;&nbsp;public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;doGet(request, response);
&nbsp;&nbsp;&nbsp;&nbsp;}
}
</pre>
<p>现在，编译部署上述的 Servlet，并使用带有 POST 方法的 hello.html 进行测试，如下所示：</p>
<pre>
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;meta charset="utf-8"&gt;
&lt;title&gt;菜鸟教程(runoob.com)&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;form action="HelloForm" method="POST"&gt;
网址名：&lt;input type="text" name="name"&gt;
&lt;br /&gt;
网址：&lt;input type="text" name="url" /&gt;
&lt;input type="submit" value="提交" /&gt;
&lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;
</pre>
<p>下面是上面表单的实际输出，尝试输入网址名和网址，然后点击"提交"按钮，Gif 演示如下：</p>
<p><img decoding="async" src="//www.runoob.com/wp-content/uploads/2014/07/servlet10.gif"></p>
<hr>
<h2>将复选框数据传递到 Servlet 程序</h2>
<p>当需要选择一个以上的选项时，则使用复选框。</p>
<p>下面是一个 HTML 代码实例 checkbox.html，一个带有两个复选框的表单。</p>
<pre>
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;meta charset="utf-8"&gt;
&lt;title&gt;菜鸟教程(runoob.com)&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;form action="CheckBox" method="POST" target="_blank"&gt;
&lt;input type="checkbox" name="runoob" checked="checked" /&gt; 菜鸟教程
&lt;input type="checkbox" name="google"  /&gt; Google
&lt;input type="checkbox" name="taobao" checked="checked" /&gt; 淘宝
&lt;input type="submit" value="选择站点" /&gt;
&lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;
</pre>

<p>下面是 CheckBox.java Servlet 程序，处理 Web 浏览器给出的复选框输入。</p>
<pre>
package com.runoob.test;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class CheckBox
 */
@WebServlet("/CheckBox")
public class CheckBox extends HttpServlet {
&nbsp;&nbsp;&nbsp;&nbsp;private static final long serialVersionUID = 1L;
    
&nbsp;&nbsp;&nbsp;&nbsp;protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// 设置响应内容类型
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;response.setContentType("text/html;charset=UTF-8");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PrintWriter out = response.getWriter();
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String title = "读取复选框数据";
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String docType = "&lt;!DOCTYPE html&gt; \n";
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println(docType +
&nbsp;&nbsp;&nbsp;&nbsp;            "&lt;html&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;            "&lt;head&gt;&lt;title&gt;" + title + "&lt;/title&gt;&lt;/head&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;            "&lt;body bgcolor=\"#f0f0f0\"&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;            "&lt;h1 align=\"center\"&gt;" + title + "&lt;/h1&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;            "&lt;ul&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;            "  &lt;li&gt;&lt;b&gt;菜鸟按教程标识：&lt;/b&gt;: "
&nbsp;&nbsp;&nbsp;&nbsp;            + request.getParameter("runoob") + "\n" +
&nbsp;&nbsp;&nbsp;&nbsp;            "  &lt;li&gt;&lt;b&gt;Google 标识：&lt;/b&gt;: "
&nbsp;&nbsp;&nbsp;&nbsp;            + request.getParameter("google") + "\n" +
&nbsp;&nbsp;&nbsp;&nbsp;            "  &lt;li&gt;&lt;b&gt;淘宝标识：&lt;/b&gt;: "
&nbsp;&nbsp;&nbsp;&nbsp;            + request.getParameter("taobao") + "\n" +
&nbsp;&nbsp;&nbsp;&nbsp;            "&lt;/ul&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;            "&lt;/body&gt;&lt;/html&gt;");
&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;&nbsp;
&nbsp;&nbsp;&nbsp;&nbsp;// 处理 POST 方法请求的方法
&nbsp;&nbsp;&nbsp;&nbsp;public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;doGet(request, response);
&nbsp;&nbsp;&nbsp;&nbsp;}
}
</pre>
<p>设置对应的 web.xml：</p>
<pre>
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;web-app&gt;
  &lt;servlet&gt;
    &lt;servlet-name&gt;CheckBox&lt;/servlet-name&gt;
    &lt;servlet-class&gt;com.runoob.test.CheckBox&lt;/servlet-class&gt;
  &lt;/servlet&gt;
  &lt;servlet-mapping&gt;
    &lt;servlet-name&gt;CheckBox&lt;/servlet-name&gt;
    &lt;url-pattern&gt;/TomcatTest/CheckBox&lt;/url-pattern&gt;
  &lt;/servlet-mapping&gt;
&lt;/web-app&gt;
</pre>
<p>上面的实例将显示下面的结果：</p>
<p><img decoding="async" src="//www.runoob.com/wp-content/uploads/2014/07/servlet11.gif"></p>
<hr>

<h2>读取所有的表单参数</h2>
<p>以下是通用的实例，使用 HttpServletRequest 的 <b>getParameterNames()</b> 方法读取所有可用的表单参数。该方法返回一个枚举，其中包含未指定顺序的参数名。</p>
<p>一旦我们有一个枚举，我们可以以标准方式循环枚举，使用 <i>hasMoreElements()</i> 方法来确定何时停止，使用 <i>nextElement()</i> 方法来获取每个参数的名称。</p>
<pre>
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class ReadParams
 */
@WebServlet("/ReadParams")
public class ReadParams extends HttpServlet {
&nbsp;&nbsp;&nbsp;&nbsp;private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public ReadParams() {
        super();
        // TODO Auto-generated constructor stub
    }

&nbsp;&nbsp;&nbsp;&nbsp;/**
&nbsp;&nbsp;&nbsp;&nbsp; * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
&nbsp;&nbsp;&nbsp;&nbsp; */
&nbsp;&nbsp;&nbsp;&nbsp;protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// 设置响应内容类型
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;response.setContentType("text/html;charset=UTF-8");
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;PrintWriter out = response.getWriter();
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String title = "读取所有的表单数据";
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String docType =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"&lt;!doctype html public \"-//w3c//dtd html 4.0 " +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"transitional//en\"&gt;\n";
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println(docType +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"&lt;html&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"&lt;head&gt;&lt;meta charset=\"utf-8\"&gt;&lt;title&gt;" + title + "&lt;/title&gt;&lt;/head&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"&lt;body bgcolor=\"#f0f0f0\"&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"&lt;h1 align=\"center\"&gt;" + title + "&lt;/h1&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"&lt;table width=\"100%\" border=\"1\" align=\"center\"&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"&lt;tr bgcolor=\"#949494\"&gt;\n" +
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"&lt;th&gt;参数名称&lt;/th&gt;&lt;th&gt;参数值&lt;/th&gt;\n"+
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;"&lt;/tr&gt;\n");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Enumeration paramNames = request.getParameterNames();

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;while(paramNames.hasMoreElements()) {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String paramName = (String)paramNames.nextElement();
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.print("&lt;tr&gt;&lt;td&gt;" + paramName + "&lt;/td&gt;\n");
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String[] paramValues =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;request.getParameterValues(paramName);
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// 读取单个值的数据
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (paramValues.length == 1) {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;String paramValue = paramValues[0];
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (paramValue.length() == 0)
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println("&lt;td&gt;&lt;i&gt;没有值&lt;/i&gt;&lt;/td&gt;");
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println("&lt;td&gt;" + paramValue + "&lt;/td&gt;");
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;} else {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// 读取多个值的数据
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println("&lt;td&gt;&lt;ul&gt;");
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;for(int i=0; i &lt; paramValues.length; i++) {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println("&lt;li&gt;" + paramValues[i]);
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println("&lt;/ul&gt;&lt;/td&gt;");
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.print("&lt;/tr&gt;");
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;out.println("\n&lt;/table&gt;\n&lt;/body&gt;&lt;/html&gt;");
&nbsp;&nbsp;&nbsp;&nbsp;}

&nbsp;&nbsp;&nbsp;&nbsp;/**
&nbsp;&nbsp;&nbsp;&nbsp; * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
&nbsp;&nbsp;&nbsp;&nbsp; */
&nbsp;&nbsp;&nbsp;&nbsp;protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// TODO Auto-generated method stub
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;doGet(request, response);
&nbsp;&nbsp;&nbsp;&nbsp;}

}
</pre>
<p>现在，通过下面的表单尝试上面的 Servlet：</p>
<pre>
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
&lt;meta charset="utf-8"&gt;
&lt;title&gt;菜鸟教程(runoob.com)&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;

&lt;form action="ReadParams" method="POST" target="_blank"&gt;
&lt;input type="checkbox" name="maths" checked="checked" /&gt; 数学
&lt;input type="checkbox" name="physics"  /&gt; 物理
&lt;input type="checkbox" name="chemistry" checked="checked" /&gt; 化学
&lt;input type="submit" value="选择学科" /&gt;
&lt;/form&gt;

&lt;/body&gt;
&lt;/html&gt;
</pre>
<p>设置相应的 web.xml:</p>
<pre>
&lt;?xml version="1.0" encoding="UTF-8"?&gt;
&lt;web-app&gt;
  &lt;servlet&gt;
    &lt;servlet-name&gt;ReadParams&lt;/servlet-name&gt;
    &lt;servlet-class&gt;com.runoob.test.ReadParams&lt;/servlet-class&gt;
  &lt;/servlet&gt;
  &lt;servlet-mapping&gt;
    &lt;servlet-name&gt;ReadParams&lt;/servlet-name&gt;
    &lt;url-pattern&gt;/TomcatTest/ReadParams&lt;/url-pattern&gt;
  &lt;/servlet-mapping&gt;
&lt;/web-app&gt;
</pre>
<p>现在使用上面的表单调用 Servlet，将产生以下结果：</p><p>
<img decoding="async" src="//www.runoob.com/wp-content/uploads/2014/07/jsrunp.gif"/></p>
<p>您可以尝试使用上面的 Servlet 来读取其他的表单数据，比如文本框、单选按钮或下拉框等。</p>			<!-- 其他扩展 -->
						
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  background: #ececec;
  color: #555;
  cursor: help;
  font-family: "Gill Sans", Impact, sans-serif;
  font-size: 20px;
  position: relative;
  text-align: center;
  width: 200px;
  -webkit-transform: translateZ(0); /* webkit flicker fix */
  -webkit-font-smoothing: antialiased; /* webkit text rendering fix */
}

.wrapper .tooltip {
  white-space: nowrap;
  font-size: 14px;
  text-align: left;
  background: #96b97d;
  bottom: 100%;
  color: #fff;
  display: block;
  left: -25px;
  margin-bottom: 15px;
  opacity: 0;
  padding: 14px;
  pointer-events: none;
  position: absolute;
  
  -webkit-transform: translateY(10px);
     -moz-transform: translateY(10px);
      -ms-transform: translateY(10px);
       -o-transform: translateY(10px);
          transform: translateY(10px);
  -webkit-transition: all .25s ease-out;
     -moz-transition: all .25s ease-out;
      -ms-transition: all .25s ease-out;
       -o-transition: all .25s ease-out;
          transition: all .25s ease-out;
  -webkit-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
     -moz-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
      -ms-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
       -o-box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
          box-shadow: 2px 2px 6px rgba(0, 0, 0, 0.28);
}
.tooltip a {
	color:#fff;
}
/* This bridges the gap so you can mouse into the tooltip without it disappearing */
.wrapper .tooltip:before {
  bottom: -20px;
  content: " ";
  display: block;
  height: 20px;
  left: 0;
  position: absolute;
  width: 100%;
}  

/* CSS Triangles - see Trevor's post */
.wrapper .tooltip:after {
  border-left: solid transparent 10px;
  border-right: solid transparent 10px;
  border-top: solid #96b97d 10px;
  bottom: -10px;
  content: " ";
  height: 0;
  left: 20%;
  margin-left: -13px;
  position: absolute;
  width: 0;
}
.wrapper .tooltip1 {
	margin-left: 50px;
	padding-top: 0px;
}
/*
.wrapper:hover .tooltip {
  opacity: 1;
  pointer-events: auto;
  -webkit-transform: translateY(0px);
     -moz-transform: translateY(0px);
      -ms-transform: translateY(0px);
       -o-transform: translateY(0px);
          transform: translateY(0px);
}
*/
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  display: none;
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<div id="postcomments"  style="display:none;" >
	<ol class="commentlist">
		<li class="comment even thread-even depth-1" id="comment-26359"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;hell</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;105***8444@qq.com</p><p><i class="fa fa-external-link" aria-hidden="true"></i> <a rel="nofollow" target="_blank" href="https://blog.csdn.net/qq_35267140/article/details/62236031">&nbsp;&nbsp;参考地址</a></p></div><div id="runoobvote-id-26359" data-commid = "26359" class="upvotejs"><a class="upvote"></a> <span class="count">35</span></div></div><div class="comt-main" id="div-comment-26359"><p>如果用 getparameter() 获取中文只有问号:</p>

<pre>String name =new String(request.getParameter("name").getBytes("ISO8859-1"),"UTF-8");</pre>
<p>由于 tomcat8 默认编码是 utf-8，而这个过滤器把他当成 ISO8859-1 解码时（即解码了两次），就会出现问题，导致所有中文变成问号</p>

<p>所以我们只需要不使用这个过滤器就可以了。</p>

<p>也就是采用以下代码：</p>

<pre>String name =new String(request.getParameter("name"));</pre>
<p>这样就能正常显示中文。</p><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">hell</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;hell</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;105***8444@qq.com</p><p><i class="fa fa-external-link" aria-hidden="true"></i> <a rel="nofollow" target="_blank" href="https://blog.csdn.net/qq_35267140/article/details/62236031">&nbsp;&nbsp;参考地址</a></p></div></span>5年前 (2018-04-16)</div></div></li><!-- #comment-## -->
<li class="comment odd alt thread-odd thread-alt depth-1" id="comment-37922"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;哔了狗的大西瓜</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;son***ijiana@163.com</p></div><div id="runoobvote-id-37922" data-commid = "37922" class="upvotejs"><a class="upvote"></a> <span class="count">23</span></div></div><div class="comt-main" id="div-comment-37922"><p>对于解决 POST 中文乱码我们可以这样：</p>

<pre>//请求解决乱码
response.setContentType("text/html;charset=utf-8");

//响应解决乱码
request.setCharacterEncoding("utf-8");</pre>

<div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">哔了狗的大西瓜</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;哔了狗的大西瓜</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;son***ijiana@163.com</p></div></span>4年前 (2018-12-11)</div></div></li><!-- #comment-## -->
<li class="comment even thread-even depth-1" id="comment-40173"><span class="comt-f">#0</span><div class="comt-avatar wrapper"><i style="font-size:36px;" class="fa fa-user-circle" aria-hidden="true"></i><div class="tooltip"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;小猫ol</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;117***3380@qq.com</p><p><i class="fa fa-external-link" aria-hidden="true"></i> <a rel="nofollow" target="_blank" href="https://www.cnblogs.com/xuedexin/articles/5617243.html">&nbsp;&nbsp;参考地址</a></p></div><div id="runoobvote-id-40173" data-commid = "40173" class="upvotejs"><a class="upvote"></a> <span class="count">10</span></div></div><div class="comt-main" id="div-comment-40173"><p><strong>request.getParameterValues(String name)</strong> 是获得如 checkbox 类（名字相同，但值有多个）的数据，接收数组变量 ，如 checkobx 类型。  </p>  

<p><strong>request.getParameter(String name)</strong> 是获得相应名的数据，如果有重复的名，则返回第一个的值，接收一般变量 ，如 text 类型。</p><div class="comt-meta wrapper"><span class="comt-author"><a target="_blank" href="javascript:;">小猫ol</a><div class="tooltip tooltip1"><p><i class="fa fa-user" aria-hidden="true"></i>&nbsp;&nbsp;&nbsp;小猫ol</p><p><i class="fa fa-envelope" aria-hidden="true"></i>&nbsp;&nbsp;117***3380@qq.com</p><p><i class="fa fa-external-link" aria-hidden="true"></i> <a rel="nofollow" target="_blank" href="https://www.cnblogs.com/xuedexin/articles/5617243.html">&nbsp;&nbsp;参考地址</a></p></div></span>4年前 (2019-02-27)</div></div></li><!-- #comment-## -->
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	<h3 class="text-muted" id="share_code" style="color: #799961;"><i class="fa fa-pencil-square-o" aria-hidden="true"></i> 点我分享笔记</h3>
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$(function() {
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	 // upload: {url:'/api/comment_upload_file.php',params: null,fileKey: 'upload_file',connectionCount: 1,leaveConfirm: '文件正在上传，您确定离开?'},
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       	    scrollTop: $("#respond").offset().top
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	});

	// 提交笔记
	var commentform=$('#commentform');
	commentform.prepend('<div id="comment-status" style="display:none;" ></div>');
	var statusdiv=$('#comment-status');
	
	commentform.submit(function(e){
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		noteContent = noteContent.replace(/<pre><code>/g,"<pre>");
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		} else {
			// var formdata=commentform.serialize() + "&comment=" + noteContent ;
			// 添加状态信息
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			// 获取表单提交地址
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			// 异步提交
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					type: 'post',
					url: formurl,
					dataType:'json',
					data: {"comment_parent":comment_parent,"comment_post_ID":comment_post_ID, "_wp_unfiltered_html_comment":_wp_unfiltered_html_comment,"comment":comment,"url":url, "email":email,"author":author},
					error: function(XMLHttpRequest, textStatus, errorThrown){
					statusdiv.html('<p class="ajax-error" >数据不完整或表单提交太快了！</p>').show();
				},
				success: function(data, textStatus){
					if(data.errorno=="0") {
						$("#submit").prop('disabled', true);
						statusdiv.html('<p class="ajax-success" >笔记已提交审核，感谢分享笔记！</p>').show();
						alert('笔记已提交审核，感谢分享笔记！');
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					commentform.find('textarea[name=comment]').val('');
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		$(this).children(".tooltip").removeAttr("style");
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	$(".wrapper i").hover(function(){
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	},function(){
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	});
	*/
	//Upvote.create('runoobvote-id', {callback: vote_callback});
	var ajaxurl = 'https://www.runoob.com/wp-admin/admin-ajax.php';
	var callback = function(data) {
		//console.log($('#runoobvote-id').upvote('upvoted'));
		//console.log($('#runoobvote-id').upvote('downvoted'));
		//console.log(data);
		_vote_action = data.action;
		id_arr = data.id.split('-');
		um_id= id_arr[2];
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		if (re.test(um_id)) { 
			var ajax_data = {
				_vote_action: _vote_action,
				action: "pinglun_zan",
				um_id: um_id,
				um_action: "ding"
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			//console.log(ajax_data);
			$.post(ajaxurl,ajax_data,function(status){
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		$('.upvotejs').upvote({id: 8589, callback: callback});
	
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				$("#runoobvote-id-" + value.commid + " .count").text(value.upvote_count);
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		},'json');
		
	}
	
	
});
function isBlank(str) {
    return (!str || /^\s*$/.test(str));
}
function kFormatter(num) {
	// return num;
    return Math.abs(num) > 999 ? Math.sign(num)*((Math.abs(num)/1000).toFixed(1)) + 'k' : Math.sign(num)*Math.abs(num)
}

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